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Digital Mapping of Differential Oxidation Arising from Fingerprint Sweat Deposits on α-Phase Brass

John W. Bond & Trudy Loe

Abstract: Visualization of differential oxidation on phase brass, subject to heating to temperatures of up to 600°C, is shown to be enhanced by selective digital mapping of colors reflected from the surface of the brass using Adobe® Photoshop®. Enhancement is optimal when the brass is heated to ~250°C with areas of oxidation having a mirror-like appearance. The use of this enhancement method to visualize fingerprint sweat deposits on brass cartridge cases is demonstrated.


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